rails association - 我可以使用：多次？

Question

我可以这样做吗？

Class School < ActiveRecord::Base
  has_many :courses
  has_many :students, :through => courses, :through => coursesections, :through => enrollments
end

Class Course < ActiveRecord::Base
  has_many :coursesections
  has_one :school
end

Class CourseSection < ActiveRecord::Base
  has_one :course
  has_one :school, :through => courses
  has_many :students, :through => enrollments
end

Class Student < ActiveRecord::Base
  has_many :sections, :through => enrollments
end

注册表只有一个student_id和一个学生注册的课程部分的section_id。